Determinaciones de paleointensidad en una secuencia volcánica en el Cáucaso menor, Georgia

  1. Ana Caccavari 1
  2. Avto Goguitchaichvili 1
  3. Manuel Calvo-Rathert 2
  4. Juan Morales 1
  5. Miguel Cervantes Solano 1
  6. Goga Vashakidze 3
  7. He Huaiyu 4
  8. V. A. Lebedev 5
  9. Néstor Vegas 6
  1. 1 Universidad Nacional Autónoma de México
    info

    Universidad Nacional Autónoma de México

    Ciudad de México, México

    ROR https://ror.org/01tmp8f25

  2. 2 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  3. 3 Tbilisi State University
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    Tbilisi State University

    Tiflis, Georgia

    ROR https://ror.org/05fd1hd85

  4. 4 Chinese Academy of Sciences
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    Chinese Academy of Sciences

    Pekín, China

    ROR https://ror.org/034t30j35

  5. 5 Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry
    info

    Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

    Moscú, Rusia

    ROR https://ror.org/054xffa50

  6. 6 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

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Journal:
Latinmag Letters

ISSN: 2007-9656

Year of publication: 2016

Volume: 6

Issue: C02

Pages: 1-7

Type: Article

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More publications in: Latinmag Letters

Abstract

We report forty-six successful absolute geomagnetic paleointensity determinations from a Pleistocenelava sequence composed of 39 successive flows in the Djavakheti Highland (Lesser Caucasus, Georgia).Available radiometric and paleomagnetic data suggest that either the lower 36 flows of the sequence mighthave been emitted between the normal-polarity Reunion and Olduvai chrons and the upper three flows afterthe Olduvai chron, or the whole sequence might have been emplaced in a short time between the Olduvaichron and 1.73 + 0.03 Ma (Caccavari et al., 2014).Paleointensity studies were performed using a Thellier type double heating method. Samples selection wasmainly based on uni-vectorial remanent magnetization, thermal stability and domain size of the samples. Flow-mean paleointensity values range from 16 ± 7.3 to 56.7 ± 15.8 µT, and corresponding virtual dipolemoments range from 2.25 ± 1.03 to 8.44 ± 2.71 x 1022 Am2.Two flows yield rather low absolute intensity suggesting a transitional regime. These flows are located neara possible discontinuity in the sequence, suggesting the onset of the Matuyama-Olduvai polarity transition,which does not appear on the directional record. This supports the interpretation of a long hiatus in volcanicactivity after the emission of the 36 lower flows of the sequence. sParts of the Virtual Dipole Momentsobtained in the present work are similar to those obtained in the same region in another lava flow sequenceof similar age.